A 50-word essay on the characteristics of Mount Laoshan

The Laoshan mountain mass has become a complex fold since the Luliang Movement in the Sinian period, and the huge granite body of Laoshan began to form in the Cretaceous period.

In the late Yanshanian Movement, which lasted from about 68 million to 130 million years ago, hot molten magma surged up from deep in the earth's crust and condensed several kilometers below the ground. The rock is fleshy red or white, and the minerals crystallize into granular shapes. It is geologically named "Laoshan Granite", but when it was born, it was not exposed above the ground.

Since the Cenozoic Era, the earth's crust has risen, and the rocks covering it have been gradually eroded away by years of wind, frost, rain, snow and long-term water flow, revealing granite stones. It was not until the middle of the Cenozoic Era 2 million years ago that it began to take on its current outline. The appearance of Laoshan Mountain was at the end of the Quaternary Period, that is, during the vicissitudes of the past tens of thousands of years. ?

The most distinctive landforms of Laoshan Mountain are the Jianfeng Qianren, towering mountains and various strange rocks. The landform of Laoshan Mountain can be roughly divided into upper and lower layers according to elevation. The upper levels are jagged peaks with an altitude of nearly 1,000 meters. They were formed during the last glacial period more than 10,000 years ago.

The natural environment is very harsh. The seawater that invaded several times during the Quaternary Period has retreated to the area near Okinawa. The Yellow and Bohai Seas have become a wasteland with a dry and cold climate. At this time, there is a large temperature difference between day and night, and between winter and summer. The granite mechanically weathers quickly under the action of freezing, and large chunks of rock break apart, forming jagged and majestic mountain peaks.